I wouldn't count on a warning from the government. If your water goes out or loses pressure, you shouldn't use if for drinking/eating/washing dishes/brushing teeth unless you boil it for at least one full minute. disinfect it with bleach
http://water.epa.gov/drink/emerprep/emergencydisinfection.cfm or until you hear it is safe.
When Isabell hit in 2003, we lost water (we're in FFX Co.). When it came on, my DH was about to use it and I told him it had to be boiled first. He was disbelieving of me because nothing about it was announced (he did humor me and boiled it). It wasn't until at least a full day after it came on that we were advised water should be boiled first. He had also scoffed at me when I filled the bathtub with water before the storm and bought a foot powered sump pump. He thought I was overreacting - until he had to use everything I had prepped. Now, he doesn't question me.